Speakers in Parallel Calculator

Simple Calculation for Speakers in Parallel

If all the speakers in parallel have the same impedance, then the calculation is easy. Simply divide the impedance by the number of speakers in parallel.

Example 1: Four 8 ohm speakers in parallel: 8 divided by 4 = 2 ohms.

Example 2: Two 4 ohms speakers in parallel: 4 divided by 2 = 2 ohms.

Not so Simple Calculations for Speakers in Parallel

For calculations involving speakers in parallel with different impedance, the following formula is required (it can be used with speakers of similar impedances too).


If you have a calculator with 1/x button then this calculation is not too difficult. If you don’t have that function on your calculator, or if you don’t like formulas, check out the calculators below.

Calculator for Speakers in Parallel

Below is my new calculator for 2, 3 or 4 speakers wired in parallel. 

Simply type the impedance of each speaker into the white boxes (or use the drop-down values). Use N/A for unused speakers in this calculator. The total impedance will be calculated for the entered speakers.

Also for each speaker is a calculated percentage. The shows how the power output of the amplifier is shared between the speakers. Power sharing is a consideration when using speakers with different impedance. See How Multiple Speakers Share Power for further details.

The final calculation is labelled “Power Differential”. This calculates in dB (decibels) the power level difference between the highest and lowest power as it is shared across the speakers in parallel. This shows the power level difference when using speakers with different impedance.

This calculator will help you understand the total speaker load on your HiFi amplifier. For a better understanding of this and what to do about it, read the articles How do I Connect Multiple Speakers to my HiFi Amplifier and How to wire four HiFi speakers or How to connect 2 speakers to one amplifier or watch the video in the article Understanding Speaker Impedance.

Note: all these calculations are for connecting manufactured speakers (boxes). They are not used when building your own speaker boxes and connecting multiple speakers in a cabinet using a crossover circuit. A crossover splits the signal into different frequencies for each of the speakers and makes the total impedance calculation complex (as impedance is frequency dependent). That is why speaker designers get the big money, and as installers we benefit from their expertise.

If you need further advice on connecting speakers in parallel, please read the FAQs before submitting your question. You also find an answer in the comments below.

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Hi Geoff!

I have amplifier which have Dynamic Power 160 W (3 ohms, Front) 125 W (4 Ohms, Front) 85 W (8 Ohms, Front),
I have 6 speakers with 16W 8ohms, can I run them?



Hi Geoff,

I installed new speakers in my car which came with stock Bose speakers because of a deal Pontiac and Bose made back in the late 1990’s. I have 2 4Ohm 30RMS 2-way speakers and 2 4Ohm 75RMS 2-way speakers. I used the stock wires and the speakers are very quiet compared to the stock speakers. I couldn’t find anything on the specs of the Bose speakers or the amp. Would I need new wires or is the amp not putting enough power?


i have two 4 ohm dvc and a 1 channel amp. i need a 2 ohm load out


Hi Geoff,
I have an amp with 2 channel @ 4 ohm/750W each. (2x Left and 2x Right). I already installed 2 speakers @ 4 ohms/550W. Question is, can I add 2 more speakers so i can utelized the 2x Left and 2x Right. And what kind of speaker should I add so that the speaking or voice volume will increase. Effects and other sound are too loud while I cant barely hear the speaking voice.

Thanks in adnvace.


This will probably make me sound a fair bit dense, but what do the 1s represent in the formula. Following the formula gives me the correct answer, but why do we divide one by the number of ohms?

Isaak (Chihuahua, Mexico)

Hi Geoff!

I have a amplifier and the lowest impedance rate of my amp is 2 ohms per channel

And I have 12 speakers of 8 ohm each and I need to connect 6 speakers on each channel

So my question is:
How can I wire up 6 speaker of 8 ohm each to get a total of 2 ohms load


Hugo Figueiredo (Lisbon, Portugal)

Hi Geoff ,

I have an amplifier Yamaha rx-v365 ( Built-in 5-channel power amplifier ,(1 kHz, 0.9% THD, 6 Ω) ,Front: 100 ,W/ch , Center: 100 W , Surround: 100 W/ch ) and i want to connect 3 speakers eatch side of the front ( 1 – 80w – 8 Ohms , 2 – 100w 8 ohms , 3 – 100w 8 Ohms ) , How should i connect ? Parallel or Series , to not burst with any of the speakers or amplifier ? Thank you for your patience .

AJ (Las Vegas, Nevada)

Designing Speaker System (Advice Needed) If I have a 700 Watt Stereo Power Amplifier (350 Watts Per Channel). I wish to wire a total of 8 speakers (4 Woofers each at 8 Ohms going to an inductor crossover & 4 Midrange Speakers each at 8 Ohms going through a 400 Volt Capacitor crossover) all together within one single speaker cabinet. How should I wire/configure this without overloading my power amplifier? 1. Woofer: Out of the four woofers (each 8 ohms) – can I safely wire each “pair” of woofers in series going to the amplifier; which will give me 4… Read more »

Pete Y (Austin)

Hi Geoff, I am looking for amp specifications to drive 6 8ohm speakers in a single outdoor room. The speakers are 150w RMS. Been through way too many articles and getting confused. Wiring 3 in parallel gets me to 2.67 ohm, but that seems pretty low. Wiring in series gets me to 24 ohm…is that just too high? Advice welcomed.

Kevin (TULSA)

I have an Episode 500 LCR speaker manufacturered by Snap AV

Link below ….


It is a 6 ohm speaker.

How can I rewire it so that all 3 channels operate as one ?

I’ve tried wiring it in series , doing it this way it sounds beautifully but it presents a 2 ohm load to the amplifier.

I’d like to rewire it so it works as a single 6 ohm speaker .

Currently my amplifier goes into safe mode and shuts down at high volume.